Php and MySQL reading data from multiple table - php

Question

What is wrong with this code. I got 3 tables I’m trying to get data from. A Recipe table, a ingredient table, and a recipeingredient table. The recipeinredient holds the ids for recipe and ingredient for the recipe. So far I can display data from recipe and recipeingredient table. Now I’m trying to get the data from the Ingredient table.
$id = $_GET['id'] ?? ''; //PHP > 7.0
$recipe_id = $id;
$recipe = find_recipe_by_id($id);
$recipeingredient_set = find_all_recipeingredient_by_recipe_id($recipe_id);
while($recipeingredient = mysqli_fetch_assoc($recipeingredient_set)){
$ingredient = find_ingredient_by_id($recipeingredient['ingredient_id']);
echo "<br /> ";
echo $ingredient['name'];
echo "<br /> ";
}
function find_ingredient_by_id($id){
global $db;
$sql = "SELECT * FROM Ingredient ";
$sql .= "WHERE id='" . $id . "'";
$result = mysqli_query($db, $sql);
confirm_result_set($result);
$ingredient = mysqli_fetch_assoc($result);
return $result; // returns an assoc. array
}
function find_all_recipeingredient_by_recipe_id($recipe_id){
global $db;
$sql = "SELECT * FROM RecipeIngredient ";
$sql .= "WHERE recipe_id='" . $recipe_id . "'";
$result = mysqli_query($db, $sql);
confirm_result_set($result);
return $result;
}

Answer 1

you are returning the result and not the array, just update your return line
function find_ingredient_by_id($id){
global $db;
$sql = "SELECT * FROM Ingredient ";
$sql .= "WHERE id='" . $id . "'";
$result = mysqli_query($db, $sql);
confirm_result_set($result);
$ingredient = mysqli_fetch_assoc($result);
return $ingredient; // returns an assoc. array
}

Answer 2

You are returning the resultset return $result; // returns an assoc. array but you should be returning the assoc array $ingredient
function find_ingredient_by_id($id){
global $db;
$sql = "SELECT * FROM Ingredient ";
$sql .= "WHERE id='" . $id . "'";
$result = mysqli_query($db, $sql); //The resultset. This is what you were returning.
confirm_result_set($result);
$ingredient = mysqli_fetch_assoc($result); //An assoc array. What you wanted to return.
return $ingredient; // returns an assoc. array
}